---
id: CVE-2026-103119
title: 'Apache Tomcat: AJP response mix-up'
summary: >-
  Buffer under-read vulnerability in Apache Tomcat meant that a large
  non-blocking write could result in the response body being split between the
  current request and the next request received on that connection leading most
  likely to fail…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cvssSource: adp
cwe:
  - CWE-127
vendor: Apache Software Foundation
product: Apache Tomcat
affected:
  - apache_tomcat >= 11.0.0-M25 <= 11.0.26
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-20T15:41:16.526893Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T15:44:52.330Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-103119'
references:
  - url: 'https://lists.apache.org/thread.html/sk2cg4k077fwcqbm6tqz2n700nq06h80'
tags:
  - cve.org
ingestedAt: '2026-10-20T14:08:00.566Z'
---

## Overview

Buffer under-read vulnerability in Apache Tomcat meant that a large non-blocking write could result in the response body being split between the current request and the next request received on that connection leading most likely to failure of the second request and possibly leakage of data from the first response to the second.



This issue affects Apache Tomcat: from 11.0.0-M25 through 11.0.26.



Users are recommended to upgrade to version 11.0.27, which fixes the issue.

## Affected

- `apache_tomcat >= 11.0.0-M25 <= 11.0.26`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.